prestanda.co.uk
Ranks Overall #347 Built Awesome #270
Data from Oct 5, 2026, 11:52 PM UTC old Measured once a week · 7 runs since Aug 21, 2026
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Wayback Machine
Lab data is measured using Lighthouse, Mobile mode unless otherwise specified. Field data is reported from Chrome UX Report (using p75 measurements).
Stack
Lighthouse Scores LAB Simulated
Metrics LAB
No field data: the Chrome UX Report is not being collected for this project, so every figure below is from the Lighthouse run.
| Metric | Lab Simulated | ||
|---|---|---|---|
| Value | Change / range | Trend | |
| LCP CWV (estimate) Largest Contentful Paint | 2.05 s good | ↓ -123 ms (-5.7%) significant 2.03 s – 2.19 s | |
| INP CWV Interaction to Next Paint — field only, no lab run can measure it | n/a | — | |
| CLS CWV (estimate) Cumulative Layout Shift | 0.047 good | ↓ -0.038 (-44.7%) significant 0.047 – 0.085 | |
| TBT Total Blocking Time | 0 ms good | → no change 0 ms – 0 ms | |
| FCP First Contentful Paint | 924 ms good | ↓ -69 ms (-6.9%) 924 ms – 1.06 s | |
| Speed Index | 924 ms good | ↓ -1063 ms (-53.5%) significant 924 ms – 1.99 s | |
| TTFB Time to First Byte | 624 ms good | ↓ -258 ms (-29.3%) significant 607 ms – 882 ms | |
LCP Subparts LAB Unthrottled
The subparts attribute LCP to your server, resource discovery, download, or rendering. Note that the Lab LCP shown above is a simulated throttled estimate.
Page weight
| Metric | Value | Change / range | Trend |
|---|---|---|---|
| Page Weight | 172 kB | ↓ -112 B (-0.1%) 172 kB – 173 kB | |
| Requests | 16 | → no change 16 – 16 | |
| Third-party Weight | 3.2 kB | ↓ -1 B 3.2 kB – 3.2 kB | |
| Third-party CPU | 2 ms | ↓ -0 ms (-13%) 2 ms – 3 ms | |
| Unused JS | 0 B | → no change 0 B – 0 B | |
| Unused CSS | 0 B | → no change 0 B – 0 B |
By resource type
| Type | Transfer | Share | Size | Requests |
|---|---|---|---|---|
| image | 44.8% | 77.3 kB | 5 | |
| font | 43.8% | 75.5 kB | 7 | |
| document | 8.2% | 14.1 kB | 1 | |
| script | 1.6% | 2.8 kB | 1 | |
| stylesheet | 1% | 1.8 kB | 1 | |
| other | 0.6% | 997 B | 1 | |
| Total | 172 kB | 16 |
Third parties 1 entities
| Entity | Transfer | Size | Main thread Simulated |
|---|---|---|---|
| Fathom Analytics | 3.2 kB | 2 ms | |
| Total | 3.2 kB | 2 ms |
Page health
| Metric | Value | Change / range | Trend |
|---|---|---|---|
| Main Thread Work | 525 ms | ↓ -145 ms (-21.6%) significant 516 ms – 705 ms | |
| Long Tasks | 0 | ↓ -1 (-100%) 0 – 1 | |
| DOM Elements | 194 | → no change 194 – 194 | |
| Axe Violations Violating nodes from a full Axe CLI run (more than Lighthouse reports) | 0 | → no change 0 – 0 | |
| A11y Failures | 0 | → no change 0 – 0 | |
| A11y Failing Nodes | 0 | → no change 0 – 0 |
Main thread work
| Task | Time | Share | Duration Simulated |
|---|---|---|---|
| other | 52% | 274 ms | |
| style layout | 28% | 149 ms | |
| paint composite render | 14% | 73 ms | |
| script evaluation | 3% | 17 ms | |
| parse HTML | 2% | 11 ms | |
| script parse compile | 0% | 1 ms | |
| Total | 525 ms |
Axe violations axe-core 4.13.0, full rule set
0 violating nodes across 0 rules, 336 passing. This is a standalone Axe CLI run and is stricter than the subset Lighthouse already includes.
Best Practices failures 1 of 18 audits
-
errors-in-console— Browser errors were logged to the console 3 items
Hygiene
Measurement log
Every stored run for this URL, newest first.
| When | Scores | Perf | LCP | CLS | TBT | Weight | Runs | Spread | Bench | Took | Archive |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Oct 5, 2026, 11:52 PM UTC | 99 | 2.05 s | 0.047 | 0 ms | 172 kB | 3/3 | ±0 | 3,059 +23% | 23s |
|
|
| Sep 28, 2026, 6:31 PM UTC | 97 | 2.17 s | 0.085 | 0 ms | 173 kB | 3/3 | ±2 | 3,293 +32% | 23.1s |
|
|
| Sep 21, 2026, 2:54 PM UTC | 99 | 2.03 s | 0.047 | 0 ms | 172 kB | 3/3 | ±12 | 2,501 +1% | 35.9s |
|
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| Sep 14, 2026, 11:55 AM UTC | 99 | 2.06 s | 0.047 | 0 ms | 173 kB | 3/3 | ±2 | 2,490 0% | 25.4s |
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| Sep 7, 2026, 8:58 AM UTC | 99 | 2.05 s | 0.047 | 0 ms | 172 kB | 3/3 | ±8 | 2,470 -1% | 25s |
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| Aug 31, 2026, 3:53 AM UTC | 99 | 2.04 s | 0.047 | 0 ms | 172 kB | 3/3 | ±2 | 2,399 -3% | 24s |
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| Aug 21, 2026, 1:49 PM UTC | 97 | 2.19 s | 0.085 | 0 ms | 173 kB | 3/3 | ±2 | 2,468 -1% | 30.9s |
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Embed this score
Use this web component to show prestanda.co.uk's scores on any website, updated whenever this instance re-measures. Don’t forget to bundle the speedlify2-score.js component code into your site!
<speedlify2-score speedlify-url="https://www.speedlify.dev/" url="https://www.prestanda.co.uk/"></speedlify2-score>